Use travis trusty to speed up build

[pavolloffay]

No description provided.

[codecov-io]

Codecov Report

Merging #145 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #145      +/-   ##
============================================
+ Coverage     36.22%   36.24%   +0.01%     
- Complexity      597      598       +1     
============================================
  Files            94       94              
  Lines          6349     6349              
  Branches       1052     1052              
============================================
+ Hits           2300     2301       +1     
  Misses         3866     3866              
+ Partials        183      182       -1

Impacted Files	Coverage Δ	Complexity Δ
.../uber/jaeger/samplers/RemoteControlledSampler.java	92.85% <0%> (+1.42%)	19% <0%> (+1%)	⬆️

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[vprithvi]

I'm not convinced that this by itself speeds up builds. Do we need to do anything additional?

[pavolloffay]

I remember that this significantly speeded up build process in Hawkular APM. Closing.

[yurishkuro]

The default precise is going away, trusty will become the default according to this. So I think it makes sense to do this, I will merge.

[pavolloffay]

closing in favour of #154